Compilare: main.c: In function 'main': main.c:14:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d", &t ); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:26:6: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d%d", &n, &k ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:19:15: warning: iteration 999998 invokes undefined behavior [-Waggressive-loop-optimizations] if ( ciur[i] == 0 ) ~~~~^~~ main.c:18:3: note: within this loop for ( i = 2; i <= 1000000; i ++ ){ ^~~